<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>弹丸菜头3.3</title>
  <style>
    .bigblock {
      width: 620px;
      height: 104px
    }
    .topone {
      width: 620px;
      height: 60px;
      background-color: #3399ff;
    }
    .littlethreeblocks div{
      float: left;
      width: 200px;
      height: 34px;
      margin-top: 10px
    }
    .littleone {
      background-color: #999999;
    }
    .littletwo {
      background-color: #000000;
      margin-left: 10px;
      margin-right: 10px
    }
    .littlethree {
      background-color: #999999;
    }
  </style>
</head>
<body>
  <div class="bigblock">
    <div class="topone"></div>
    <div class="littlethreeblocks">
      <div class="littleone"></div>
      <div class="littletwo"></div>
      <div class="littlethree"></div>
    </div>
  </div>
</body>
</html>